Precision Low Drift 2.048 V/2.500 V
SOT-23 Voltage Reference
ADR380/ADR381
FEATURES
Initial accuracy: ±5 mV/±6 mV maximum
Initial accuracy error: ±0.24%/±0.24%
Low TCV
OUT
: 25 ppm/°C maximum
Load regulation: 70 ppm/mA
Line regulation: 25 ppm/V
Wide operating ranges
2.4 V to 18 V for ADR380
2.8 V to 18 V for ADR381
Low power: 120 μA maximum
High output current: 5 mA
Wide temperature range: −40°C to +85°C
Tiny 3-lead SOT-23 package with standard pinout
PIN CONFIGURATION
V
IN 1
ADR380/
ADR381
3
GND
02175-001
TOP VIEW
V
OUT 2
(Not to Scale)
Figure 1. 3-Lead SOT-23
(RT Suffix)
APPLICATIONS
Battery-powered instrumentation
Portable medical instruments
Data acquisition systems
Industrial process control systems
Hard disk drives
Automotive
GENERAL DESCRIPTION
The ADR380 and ADR381 are precision 2.048 V and 2.500 V
band gap voltage references featuring high accuracy, high
stability, and low power consumption in a tiny footprint.
Patented temperature drift curvature correction techniques
minimize nonlinearity of the voltage change with temperature.
The wide operating range and low power consumption make
them ideal for 3 V to 5 V battery-powered applications.
The ADR380 and ADR381 are micropower, low dropout
voltage (LDV) devices that provide a stable output voltage from
supplies as low as 300 mV above the output voltage. They are
specified over the industrial (−40°C to +85°C) temperature
range. The ADR380/ADR381 are available in the tiny 3-lead
SOT-23 package.
Table 1. ADR38x Products
Part Number
ADR380
ADR381
Nominal Output Voltage (V)
2.048
2.500
Rev. C
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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Fax: 781.461.3113 ©2001–2010 Analog Devices, Inc. All rights reserved.
ADR380/ADR381
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
ADR380 Electrical Characteristics............................................. 3
ADR381 Electrical Characteristics............................................. 4
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
Terminology .................................................................................... 10
Theory of Operation ...................................................................... 11
Device Power Dissipation Considerations .............................. 11
Input Capacitor ........................................................................... 11
Output Capacitor........................................................................ 11
Applications Information .............................................................. 12
Stacking Reference ICs for Arbitrary Outputs ....................... 12
A Negative Precision Reference Without Precision Resistors
....................................................................................................... 12
Precision Current Source .......................................................... 12
Precision High Current Voltage Source .................................. 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
REVISION HISTORY
10/10—Rev. B to Rev. C
Deleted Figure 32 ............................................................................ 14
Changes to Ordering Guide .......................................................... 14
1/09—Rev. A to Rev. B
Updated Format .................................................................. Universal
Changes to Table 7 ............................................................................ 5
Changes to Stacking Reference ICs for Arbitrary Outputs
Section, Figure 28, and Figure 29 ................................................. 12
Updated Outline Dimensions ....................................................... 14
Changes to Ordering Guide .......................................................... 14
7/04—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Changes to Ordering Guide .......................................................... 16
Updated Outline Dimensions ....................................................... 16
Rev. C | Page 2 of 16
ADR380/ADR381
SPECIFICATIONS
ADR380 ELECTRICAL CHARACTERISTICS
V
IN
= 5.0 V, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
Output Voltage
Initial Accuracy Error
Temperature Coefficient
Minimum Supply Voltage Headroom
Line Regulation
Load Regulation
Quiescent Current
Voltage Noise
Turn-On Settling Time
Long-Term Stability
Output Voltage Hysteresis
Ripple Rejection Ratio
Short Circuit to GND
Symbol
V
OUT
V
OERR
TCV
OUT
V
IN
– V
OUT
ΔV
OUT
/DV
IN
ΔV
OUT
/DI
LOAD
I
IN
e
N
t
R
ΔV
OUT
V
OUT_HYS
RRR
I
SC
Conditions
Min
2.043
−5
−0.24
Typ
2.048
Max
2.053
+5
+0.24
25
21
25
70
120
140
Unit
V
mV
%
ppm/°C
ppm/°C
mV
ppm/V
ppm/mA
μA
μA
μV p-p
μs
ppm
ppm
dB
mA
−40°C < T
A
< +85°C
0°C < T
A
< 70°C
I
LOAD
≤ 3 mA
V
IN
= 2.5 V to 15 V, −40°C < T
A
< +85°C
V
IN
= 3 V, I
LOAD
= 0 mA to 5 mA,
−40°C < T
A
< +85°C
No load
−40°C < T
A
< +85°C
0.1 Hz to 10 Hz
1000 Hrs
f
IN
= 60 Hz
5
3
300
10
100
5
20
50
40
85
25
V
IN
= 15.0 V, T
A
= 25°C, unless otherwise noted.
Table 3.
Parameter
Output Voltage
Initial Accuracy Error
Temperature Coefficient
Minimum Supply Voltage Headroom
Line Regulation
Load Regulation
Quiescent Current
Voltage Noise
Turn-On Settling Time
Long-Term Stability
Output Voltage Hysteresis
Ripple Rejection Ratio
Short Circuit to GND
Symbol
V
OUT
V
OERR
TCV
OUT
V
IN
− V
OUT
ΔV
OUT
/DV
IN
ΔV
OUT
/DI
LOAD
I
IN
e
N
t
R
ΔV
OUT
V
OUT_HYS
RRR
I
SC
−40°C < T
A
< +85°C
0°C < T
A
< 70°C
I
LOAD
≤ 3 mA
V
IN
= 2.5 V to 15 V, −40°C < T
A
< +85°C
V
IN
= 3 V, I
LOAD
= 0 mA to 5 mA,
−40°C < T
A
< +85°C
No load
−40°C < T
A
< +85°C
0.1 Hz to 10 Hz
1000 Hrs
f
IN
= 60 Hz
Conditions
Min
2.043
−5
−0.24
Typ
2.048
Max
2.053
+5
+0.24
25
21
25
70
120
140
Unit
V
mV
%
ppm/°C
ppm/°C
mV
ppm/V
ppm/mA
μA
μA
μV p-p
μs
ppm
ppm
dB
mA
5
3
300
10
100
5
20
50
40
85
25
Rev. C | Page 3 of 16
ADR380/ADR381
ADR381 ELECTRICAL CHARACTERISTICS
V
IN
= 5.0 V, T
A
= 25°C, unless otherwise noted.
Table 4.
Parameter
Output Voltage
Initial Accuracy Error
Temperature Coefficient
Minimum Supply Voltage Headroom
Line Regulation
Load Regulation
Quiescent Current
Voltage Noise
Turn-On Settling Time
Long-Term Stability
Output Voltage Hysteresis
Ripple Rejection Ratio
Short Circuit to GND
Symbol
V
OUT
V
OERR
TCV
OUT
V
IN
− V
OUT
ΔV
OUT
/DV
IN
ΔV
OUT
/DI
LOAD
I
IN
e
N
t
R
ΔV
OUT
V
OUT_HYS
RRR
I
SC
−40°C < T
A
< +85°C
0°C < T
A
< 70°C
I
LOAD
≤ 2 mA
V
IN
= 2.8 V to 15 V, −40°C < T
A
< +85°C
V
IN
= 3.5 V, I
LOAD
= 0 mA to 5 mA,
−40°C < T
A
< +85°C
No load
−40°C < T
A
< +85°C
0.1 Hz to 10 Hz
1000 Hrs
f
IN
= 60 Hz
Conditions
Min
2.494
−6
−0.24
Typ
2.500
Max
2.506
+6
+0.24
25
21
25
70
120
140
Unit
V
mV
%
ppm/°C
ppm/°C
mV
ppm/V
ppm/mA
μA
μA
μV p-p
μs
ppm
ppm
dB
mA
5
3
300
10
100
5
20
50
75
85
25
V
IN
= 5.0 V, T
A
= 25°C, unless otherwise noted.
Table 5.
Parameter
Output Voltage
Initial Accuracy Error
Temperature Coefficient
Minimum Supply Voltage Headroom
Line Regulation
Load Regulation
Quiescent Current
Voltage Noise
Turn-On Settling Time
Long-Term Stability
Output Voltage Hysteresis
Ripple Rejection Ratio
Short Circuit to GND
Symbol
V
OUT
V
OERR
TCV
OUT
V
IN
− V
OUT
ΔV
OUT
/DV
IN
ΔV
OUT
/DI
LOAD
I
IN
e
N
t
R
ΔV
OUT
V
OUT_HYS
RRR
I
SC
−40°C < T
A
< +85°C
0°C < T
A
< 70°C
I
LOAD
≤ 2 mA
V
IN
= 2.8 V to 15 V, −40°C < T
A
< +85°C
V
IN
= 3.5 V, I
LOAD
= 0 mA to 5 mA,
−40°C < T
A
< +85°C
No load
−40°C < T
A
< +85°C
0.1 Hz to 10 Hz
1000 Hrs
f
IN
= 60 Hz
Conditions
Min
2.494
−6
−0.24
Typ
2.500
Max
2.506
+6
+0.24
25
21
25
70
120
140
Unit
V
mV
%
ppm/°C
ppm/°C
mV
ppm/V
ppm/mA
μA
μA
μV p-p
μs
ppm
ppm
dB
mA
5
3
300
10
100
5
20
50
75
85
25
Rev. C | Page 4 of 16
ADR380/ADR381
ABSOLUTE MAXIMUM RATINGS
Table 6.
Parameter
1
Supply Voltage
Output Short-Circuit Duration to GND
V
IN
> 15 V
V
IN
≤ 15 V
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 Sec)
1
THERMAL RESISTANCE
Rating
18 V
10 sec
Indefinite
−65°C to +150°C
−40°C to +85°C
−65°C to +150°C
300°C
θ
JA
is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 7.
Package Type
3-Lead SOT-23 (RT)
θ
JA
333
Unit
°C/W
ESD CAUTION
Absolute maximum ratings apply at 25°C, unless otherwise noted.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. C | Page 5 of 16
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